How do Santa's Reindeer fly? Once they are up, how do they stay in the air?

I was always led to believe that Santa would sprinkle magic dust over the to make them fly. There is an awful lot of speculation but will we ever really know what makes the Reindeer fly?

We already know that Reindeer do not have wings, we also know that they are not normally known for flying. So what makes them different?

Well some say that Santa feeds them magical carrots that that make em fly. Others believe they eat a special brand of grain that gives them flying power. Mabe it is Aviation dust that makes them fly.

Or it is just simply the magic of the Christmas spirit.